Key information relevant to the recruitment process for the
overall study, such as dates of the recruitment period and locations

Participants were healthy males and females, age 6 months to 17 years, recruited from existing volunteer populations and from the communities at large around the clinical sites. Participants were enrolled between 20AUG2009 and 21SEP2009.

Pre-Assignment Details

Significant events and approaches for the overall study
following participant enrollment, but prior to group assignment

No text entered.

Reporting Groups

Description

Group 1: Day 0-H1N1; Day 21-H1N1; Day 42-TIV

Participants received 15 mcg H1N1 Vaccine on Day 0; 15 mcg H1N1 Vaccine on Day 21, and Trivalent Influenza Vaccine (TIV) on Day 42

Explanation of how the number of participants for analysis was determined.
Includes whether analysis was per protocol, intention to treat, or another method.
Also provides relevant details such as imputation technique, as appropriate.

No text entered.

Reporting Groups

Description

Group 1: Day 0-H1N1; Day 21-H1N1; Day 42-TIV

Participants received 15 mcg H1N1 Vaccine on Day 0; 15 mcg H1N1 Vaccine on Day 21, and Trivalent Influenza Vaccine (TIV) on Day 42

Number of Participants Age 6 Months to Less Than 36 Months With 4-fold or Greater Hemagglutination Inhibition Assay (HAI) Antibody Titer Increases Against the Influenza H1N1 2009 Virus 21 Days Following the First Dose of H1N1 Vaccine [ Time Frame: Day 0 prior to vaccination and 21 days after the first H1N1 vaccination ]

Number of Participants Age 36 Months to 9 Years With 4-fold or Greater Hemagglutination Inhibition Assay (HAI) Antibody Titer Increases Against the Influenza H1N1 2009 Virus 21 Days Following the First Dose of H1N1 Vaccine [ Time Frame: Day 0 prior to vaccination and 21 days after the first H1N1 vaccination ]

Number of Participants Age 10 to 17 Years With 4-fold or Greater Hemagglutination Inhibition Assay (HAI) Antibody Titer Increases Against the Influenza H1N1 2009 Virus 21 Days Following the First Dose of H1N1 Vaccine [ Time Frame: Day 0 prior to vaccination and 21 days after the first H1N1 vaccination ]

Number of Participants Age 10 to 17 Years Reporting Solicited Subjective Systemic Reactions After the Second Vaccination

Measure Description

Participants or their parents/guardians maintained a memory aid to record daily the occurrence of systemic symptoms of feverishness, malaise, myalgia, headache, nausea and decreased general activity for 8 days after vaccination (Day 0-7) based on their interference with daily activities. Participants are counted if they were reported as experiencing the symptom at any severity on any of the 8 days.

Time Frame

Within 8 days (Day 0-7) post second vaccination

Safety Issue

Yes

Population Description

Explanation of how the number of participants for analysis was determined.
Includes whether analysis was per protocol, intention to treat, or another method.
Also provides relevant details such as imputation technique, as appropriate.

All participants receiving the second vaccination are included in the safety cohort. Analyses are as treated. This outcome measure is restricted to protocol-defined age stratum.

Reporting Groups

Description

Group 1: Day 0-H1N1; Day 21-H1N1; Day 42-TIV

Participants received 15 mcg H1N1 Vaccine on Day 0; 15 mcg H1N1 Vaccine on Day 21, and Trivalent Influenza Vaccine (TIV) on Day 42

Number of Participants Age 6 to Less Than 36 Months Reporting Solicited Subjective Local Reactions After the Second H1N1 Vaccination [ Time Frame: Within 8 days (Day 0-7) post second H1N1 vaccination ]

Number of Participants Age 6 to Less Than 36 Months Reporting Solicited Quantitative Local Reactions After the First H1N1 Vaccination [ Time Frame: Within 8 days (Day 0-7) post first H1N1 vaccination ]

Number of Participants Age 6 to Less Than 36 Months Reporting Solicited Quantitative Local Reactions After the Second H1N1 Vaccination [ Time Frame: Within 8 days (Day 0-7) post second H1N1 vaccination ]

Number of Participants Age 6 Months to Less Than 36 Months With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer of 1:40 or Greater Against the H1N1 2009 Virus 21 Days Following the First Dose of H1N1 Vaccine [ Time Frame: Day 21 after first H1N1 vaccination ]

Number of Participants Age 36 Months to 9 Years With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer of 1:40 or Greater Against the H1N1 2009 Virus 21 Days Following the First Dose of H1N1 Vaccine [ Time Frame: Day 21 after first H1N1 vaccination ]

Number of Participants Age 10 to 17 Years With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer of 1:40 or Greater Against the H1N1 2009 Virus 21 Days Following the First Dose of H1N1 Vaccine [ Time Frame: Day 21 after first H1N1 vaccination ]

Number of Participants Age 6 to Less Than 36 Months With 4-fold or Greater Hemagglutination Inhibition Assay (HAI) Antibody Titer Increases Against the Virus Strains in the 2009-2010 Trivalent Influenza Vaccine (TIV) 21 Days Following the Last Vaccination [ Time Frame: Day 0 prior to first vaccination and 21 days after last vaccination ]

Number of Participants Age 36 Months to 9 Years With 4-fold or Greater Hemagglutination Inhibition Assay (HAI) Antibody Titer Increases Against the Virus Strains in the 2009-2010 Trivalent Influenza Vaccine (TIV) 21 Days Following the Last Vaccination [ Time Frame: Day 0 prior to first vaccination and Day 21 after last vaccination ]

Number of Participants Age 10 to 17 Years With 4-fold or Greater Hemagglutination Inhibition Assay (HAI) Antibody Titer Increases Against the Virus Strains in the 2009-2010 Trivalent Influenza Vaccine (TIV) 21 Days Following the Last Vaccination [ Time Frame: Day 0 prior to first vaccination and Day 21 after last vaccination ]

Number of Participants Age 6 to Less Than 36 Months With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer of 1:40 or Greater Against the Virus Strains in the 2009-2010 Trivalent Influenza Vaccine (TIV) 21 Days Following the Last Vaccination [ Time Frame: Day 21 after last vaccination ]

Number of Participants Age 36 Months to 9 Years With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer of 1:40 or Greater Against the Virus Strains in the 2009-2010 Trivalent Influenza Vaccine (TIV) 21 Days Following the Last Vaccination [ Time Frame: Day 21 after last vaccination ]

Number of Participants Age 10 to 17 Years With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer of 1:40 or Greater Against the Virus Strains in the 2009-2010 Trivalent Influenza Vaccine (TIV) 21 Days Following the Last Vaccination [ Time Frame: Day 21 after last vaccination ]

Number of Participants Age 6 to Less Than 36 Months With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer of 1:40 or Greater Against the H1N1 2009 Virus 21 Days Following the Second Dose of H1N1 Vaccine [ Time Frame: Day 21 after the second H1N1 vaccination ]

Number of Participants Age 36 Months to 9 Years With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer of 1:40 or Greater Against the H1N1 2009 Virus 21 Days Following the Second Dose of H1N1 Vaccine [ Time Frame: Day 21 after the second H1N1 vaccination ]

Number of Participants Age 10 to 17 Years With a Serum Hemagglutination Inhibition Assay (HAI) Antibody Titer of 1:40 or Greater Against the H1N1 2009 Virus 21 Days Following the Second Dose of H1N1 Vaccine [ Time Frame: Day 21 after the second H1N1 vaccination ]

Number of Participants Age 6 to Less Than 36 Months With 4-fold or Greater Hemagglutination Inhibition Assay (HAI) Antibody Titer Increases Against the Influenza H1N1 2009 Virus 21 Days Following the Second Dose of H1N1 Vaccine [ Time Frame: Day 0 prior to first vaccination and 21 days after the second H1N1 vaccination ]

Number of Participants Age 36 Months to 9 Years With 4-fold or Greater Hemagglutination Inhibition Assay (HAI) Antibody Titer Increases Against the Influenza H1N1 2009 Virus 21 Days Following the Second Dose of H1N1 Vaccine [ Time Frame: Day 0 prior to first vaccination and 21 days after the second H1N1 vaccination ]

Number of Participants Age 10 to 17 Years With 4-fold or Greater Hemagglutination Inhibition Assay (HAI) Antibody Titer Increases Against the Influenza H1N1 2009 Virus 21 Days Following the Second Dose of H1N1 Vaccine [ Time Frame: Day 0 prior to first vaccination and 21 days after the second H1N1 vaccination ]